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Lubricant Additive Component Anti-chemical Corrosion, Rust May 17, 2017

First, the classification and development of lubricants and lubricants additives

Lubricant: Generalized lubricants is not a single finger lubricating oil, its meaning is equivalent to the lubricant. The history of butter is the earliest lubricant, as early as 1400 BC, butter was used to lubricate the wheels. Modern lubricants are divided into solid lubricants with semi-solid lubricants, as well as liquid lubricants. Solid lubricants such as graphite, molybdenum disulfide. Semi-solid lubricant For example: Grease Liquid Lubricant: Lubricant.

Lubricants must meet three requirements:

1. Lubrication;

2. Chemical stability;

3. Viscosity and other processes must be used to achieve some of the performance, such as resistance to high and low temperature, anti-chemical corrosion, rust, anti-emulsification, cleaning performance and service life. Therefore, as a lubricant engineer the premise of the correct use of lubricants is a comprehensive understanding of the operation of the machine equipment and operating conditions.

Second, the general description of lubricants additives

Lubricant Additive Component: The concept of Lubricant Additive Component is to add one or more compounds in the lubricant to give the lubricant some new properties or to improve some of the properties already present in the lubricant. General lubricating oil additives is mainly to adjust the characteristics of base oil, making it more suitable for use. Specifically include the following types:

Antiwear agent

Purpose: to reduce friction and wear

Lubricant Additive Component Typical compounds: compounds containing sulfur, phosphorus, chlorine, lead and the like. Such as sulfurized olefins, chlorinated paraffins, ZDDP (dialkyl dithiophosphates), borates, etc., which form an adsorbed film or a repellent film on the frictional surface to protect the frictional surface.

How it works: Extreme pressure additives can react chemically with the metal surface to produce iron phosphide that prevents metal and metal from contacting. Only in the high temperature state of the oil film began to weaken the case will appear solid film


 Purpose: to maintain the friction surface clean, and lubricating oil degradation caused by acidic substances

Typical compounds: sulfonates, alkyl phenates, sulfated polyisobutylene barium salts, alkyl salicylates, etc.

 Working principle: The cleaning agent reacts chemically with the chemical substance, neutralizes these substances, keeps these substances in a soluble state, and does not deposit to form mud, gel, lacquered and coke deposits.


 Purpose: To keep the insoluble matter in the oil suspended in the oil or friction pair, to prevent further agglomeration

Typical compounds: ester compounds with long chain

 working principle: dispersant will be wrapped in pollutants, so that pollutants remain in a suspended state, to prevent the accumulation of pollutants and oxidation products.


 Purpose: Seal - expansion control agent to prevent leakage of lubricating oil from the gasket and seal.

 Features: This improver is made from organic esters and exhibits only slight sealing expansion in tight fit.

 working principle: the additive into the seal, the rubber structure can be slightly expanded and help to prevent leakage of lubricants.


 Purpose: To prevent the oxidation of lubricating oil

 typical compounds: oxygen, dialkyl dithiophosphate, amine salts, etc., are generally through the sacrifice themselves to protect the oil.

 working principle: antioxidants can make multiple carbon and oxygen bonds to form long chain fracture, significantly slow down the natural deterioration of lubricating oil process.

Anti-corrosion anti-rust agent

 Purpose: To prevent non-ferrous metals from corrosion and to prevent corrosion of ferrous metals

 typical compounds: with the polarity of the oil-based compounds. Generally by adsorption in the metal surface and thus play a protective role.

 Working principle: Such protective agent through the preferential adsorption of metal surface inhibitor polar components to form a protective film, to resist water intrusion. Viscosity index improver

 Purpose: To improve the viscosity-temperature properties of lubricating oils to obtain the desired viscosity properties.

 typical compounds: polymer compounds or polymers.

 Working principle: Viscosity modifier can increase the thickness of low viscosity base oil, increase the lubricating oil

Of the viscosity index.

Pour pouring agent

 Purpose: To reduce the pour point of lubricating oil

 typical compounds: generally with polar groups of polymer compounds such as polymethacrylate, alkyl naphthalene and other compounds.

 working principle: at low temperatures, through the refining of the base oil contained in a small amount of dissolved wax will appear crystallization, so that base oil thickening. The pour point depressant can reduce the formation of crystals and maintain the flowability of the lubricating oil.

Anti - foaming agent

 Purpose: to reduce the use of lubricants in the foam or the timely elimination of foam

 typical compounds: generally methyl silicone oil or polyacrylate compounds

• Special additives to change the interfacial tension of oil and gas

• Promote rapid bursting of oil on the surface of the oil